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UUIDGEN(1) FreeBSD General Commands Manual UUIDGEN(1)
NAMEuuidgen -- generate universally unique identifiers
SYNOPSISuuidgen [-1] [-ncount] [-ofilename]
DESCRIPTION
The uuidgen utility by default generates a single DCE version 1 univer-
sally unique identifier (UUID), also known as a globally unique identi-
fier (GUID). The UUID is written to stdout by default. The following
options can be used to change the behaviour of uuidgen:
-1 This option only has effect if multiple identifiers are to be
generated and instructs uuidgen to not generate them in batch,
but one at a time.
-n This option controls the number of identifiers generated. By
default, multiple identifiers are generated in batch. The upper
hard limit is 2048 (see uuidgen(2)).
-o Redirect output to filename instead of stdout.
Batched generation yields a dense set of identifiers in such a way that
there is no identifier that is larger than the smallest identifier in the
set and smaller than the largest identifier in the set and that is not
already in the set.
When generating the identifiers one at a time, the identifiers will be
close to each other, but operating system latency and processing time
will be reflected in the distance between two successive identifiers.
EXIT STATUS
The uuidgen utility exits 0 on success, and >0 if an error occurs.
SEE ALSOuuidgen(2), uuid(3)HISTORY
The uuidgen command first appeared in FreeBSD 5.0.
FreeBSD 10.2 May 23, 2012 FreeBSD 10.2